<template>
  <view class="cart-container" v-if="cart.length !== 0">
    <my-address></my-address>
    <!-- 购物车商品列表的标题区域 -->
    <view class="cart-title">
      <!-- 左侧的图标 -->
      <uni-icons type="shop" size="18"></uni-icons>
      <!-- 描述文本 -->
      <text class="cart-title-text">购物车</text>
    </view>
    <!-- 商品列表区域 -->
    <uni-swipe-action>
      <block v-for="(goods, i) in cart" :key="i">   
        <uni-swipe-action-item
          :right-options="options"
          @click="swipeDelete(goods.goods_id)"
        >
          <my-goods
            :goods="goods" 
            :showRadio="true"
            @radio-change="radioHandle"
            :showNum="true"
            @num-change="numHandle"
          ></my-goods>
        </uni-swipe-action-item>
      </block>
    </uni-swipe-action>
    
    <!-- 结算区域 -->
    <my-settle></my-settle>
  </view>
  <!-- 空白购物车区域 -->
  <view class="empty-cart" v-else>
    <image src="/static/cart_empty@2x.png" class="empty-img"></image>
    <text class="tip-text">空空如也~</text>
  </view>
</template>

<script>
  import bdgeMix from '@/mixins/tabbar-badge.js'
// 按需导入 mapGetters 这个辅助方法
import { mapGetters, mapState, mapMutations } from 'vuex';
export default {
  mixins: [bdgeMix],
  data() {
    return {
      options: {
        text: '删除',
        style: {
          backgroundColor: '#c00000'
        }
      }
    };
  },
  methods: {
    ...mapMutations('m_cart', ['updateState', 'updateNum', 'removeGoods']),
    radioHandle(e) {
      // 修改 store 数组中 cart 数组中当前这一个商品的勾选状态
      this.updateState(e)
    },
    numHandle(e) {
      this.updateNum(e)
    },
    swipeDelete(id) {
      this.removeGoods(id)
    }
  },
  computed: {
    // 将 m_cart 模块中的 total 映射为当前页面的计算属性
    ...mapGetters('m_cart', ['goods_total']),
    ...mapState('m_cart', ['cart'])
  },
  onShow() {
    // 调用 uni.setTabBarBadge() 方法，为购物车设置右上角的徽标
    uni.setTabBarBadge({
      index: 2, // 索引
      text: this.goods_total.toString() // 注意：text 的值必须是字符串，不能是数字
    });
  }
};
</script>

<style lang="scss">
.cart-title {
  height: 40px;
  display: flex;
  align-items: center;
  font-size: 14px;
  padding-left: 5px;
  border-bottom: 1px solid #efefef;
  .cart-title-text {
    margin-left: 10px;
  }
}
.cart-container {
  padding-bottom: 50px;
}
.empty-cart {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 150px;

  .empty-img {
    width: 90px;
    height: 90px;
  }

  .tip-text {
    font-size: 12px;
    color: gray;
    margin-top: 15px;
  }
}
</style>
